using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class FileUpload : System.Web.UI.Page...{ protected void Page_Load(object sender, EventArgs e) ...{ } protected void Button1_Click(object sender, EventArgs e) ...{ bool fileOK = false; string path = Server.MapPath("~/temp/"); if (FileUpload1.HasFile) ...{ String fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower(); String[] allowedExtension =...{ ".gif", ".png", ".bmp", ".jpg" }; for (int i = 0; i < allowedExtension.Length; i++) ...{ if (fileExtension == allowedExtension[i]) ...{ fileOK = true; } } } if (fileOK) ...{ try ...{ FileUpload1.SaveAs(path + FileUpload1.FileName); Label1.Text = "文件上传成功!"; } catch (Exception ex) ...{ Label1.Text = "文件上传不成功!"; } } else ...{ Label1.Text = "只能上传图片文件!"; } }}